matrix: fix instant crash with e2ee

also some more attempts at fixing it, so far all i've found is that if
we don't delete the cryptoStore, the matrix client also gets the same
error we do if it send s a message to us (no session with given ID
found).

matrix_crypto.go

@@ -3,7 +3,6 @@
 package main
 
 import (
-	"fmt"
 	"strings"
 
 	"maunium.net/go/mautrix"
@@ -96,7 +95,6 @@ func InitMatrixCrypto(d *MatrixDaemon) (err error) {
 	// If the db is maintained after restart, element reports "The secure channel with the sender was corrupted" when sending a message from the bot.
 	// This obviously isn't right, but it seems to work.
 	// Since its not really used anyway, just use the deprecated GobStore. This reduces cgo usage anyway.
-	// os.Remove(dbPath)
 	var cryptoStore *crypto.GobStore
 	cryptoStore, err = crypto.NewGobStore(dbPath)
 	// d.db, err = sql.Open("sqlite3", dbPath)
@@ -112,7 +110,7 @@ func InitMatrixCrypto(d *MatrixDaemon) (err error) {
 	// }
 	olm := crypto.NewOlmMachine(d.bot, olmLog, cryptoStore, &stateStore{&d.isEncrypted})
 	olm.AllowUnverifiedDevices = true
-	err = d.crypto.olm.Load()
+	err = olm.Load()
 	if err != nil {
 		return
 	}
@@ -151,8 +149,11 @@ func HandleSyncerCrypto(startTime int64, d *MatrixDaemon, syncer *mautrix.Defaul
 		if evt.Timestamp < startTime {
 			return
 		}
-		fmt.Printf("%+v\n", d.crypto.cryptoStore.GroupSessions)
 		decrypted, err := d.crypto.olm.DecryptMegolmEvent(evt)
+		// if strings.Contains(err.Error(), crypto.NoSessionFound.Error()) {
+		// 	d.app.err.Printf("Failed to decrypt Matrix message: no session found")
+		// 	return
+		// }
 		if err != nil {
 			d.app.err.Printf("Failed to decrypt Matrix message: %v", err)
 			return
@@ -189,7 +190,6 @@ func EncryptRoom(d *MatrixDaemon, room *mautrix.RespCreateRoom, userID id.UserID
 		return
 	}
 	userIDs = append(userIDs, userID)
-	err = d.crypto.olm.ShareGroupSession(room.RoomID, userIDs)
 	return
 }